/Engine/Source/Runtime/Engine/Public/MaterialShared.h
Uniquely identifies a material expression output. Used by the material compiler to keep track of which output it is compiling.
class FMaterialExpressionKey
bool
bCompilingPreviousFrameKey
Expressions are different (e.g. View.PrevWorldViewOrigin) when using previous frame's values, value if from FHLSLMaterialTranslator::bCompilingPreviousFrame.
UMaterialExpres...
Expression
FGuid
MaterialAttributeID
Attribute currently being compiled through a MatterialAttributes connection.
int32
OutputIndex